'Deadly missiles': Unsecured trailers pose threat to you and your family

NBC national investigative correspondent Jeff Rossen reports on a potentially deadly hazard on the road: improperly hitched trailers that come loose and become "deadly missiles."

Kristie Cox lost nearly everything because of a missing safety pin and chain.

An improperly hitched trailer broke free on the road, slamming into her husband's SUV, tearing through its windshield and crushing the vehicle's left side. Her husband, Jeremy, and her 3-year-old daughter, Izzy, were both killed instantly. Only her son, Liam, survived.

Experts say such improperly hitched trailers are a common problem on America's roadways, one that has taken more than 300 lives in recent years.